Secretary of Homeland Security Michael Chertoff says he's seen no recent intelligence about a specific plot against the US. Also, hawks and doves within the Bush Administration are at odds over the opportunities being created by civil unrest in Iran.

FROM THIS EPISODE

Secretary of Homeland Security Michael Chertoff says he's seen no recent intelligence about a specific plot against the US. The terror alert level has not been raised, although security has been tightened on air travel and public transit in advance of the Fourth of July. Also, hawks and doves within the Bush Administration are at odds over the opportunities being created by civil unrest in Iran. Should the US and its allies get tough in hopes of regime change or approach Iranian moderates about helping to stabilize Iraq and Afghanistan.

British officials say the same men who attacked Glasgow Airport in a flaming Jeep Cherokee also rigged two Mercedes to explode in London the day before. Seven people have been arrested in those attacks, two of them doctors. We hear more about the investigation and what it could mean for the US.

Guests:Michael Evans, Defense Editor for The Times of LondonRobert Block, Space Editor, Orlando SentinelBob Ayres, Associate Fellow in International Security at Chatham House

For the past several weeks, the government of President Mahmoud Ahmadinejad has cracked down on signs of cultural openness and dissent in Iran. Because of his increased efforts to enrich nuclear materials, the US and some of its allies have been threatening international sanctions. Last month, Ahmadinejad raised gasoline prices by 25 percent and last week, without advance notice, he instituted gasoline rationing. Demonstrators set fire to at least a dozen gas stations in Tehran and chanted slogans against Ahmadinejad. Banks, supermarkets and fire engines were attacked, and there are reports of trouble in other big cities, too. Will such civil unrest provide an opportunity for the West to get tough or to ask Iranian moderates for help in Iraq and Afghanistan?